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java.lang.Object | +----java.lang.Runtime
exec(String)
exec(String, String[])
exec(String[])
exec(String[], String[])
exit(int)
freeMemory()
gc()
getLocalizedInputStream(InputStream)
getLocalizedOutputStream(OutputStream)
getRuntime()
load(String)
loadLibrary(String)
runFinalization()
runFinalizersOnExit(boolean)
totalMemory()
traceInstructions(boolean)
traceMethodCalls(boolean)
getRuntime
public static Runtime getRuntime()
Runtime object associated with the current
Java application.
exit
public void exit(int status)
If there is a security manager, its checkExit method
is called with the status as its argument. This may result in a
security exception.
The argument serves as a status code; by convention, a nonzero status code indicates abnormal termination.
runFinalizersOnExit
public static void runFinalizersOnExit(boolean value)
exec
public Process exec(String command) throws IOException
The command argument is parsed into tokens and then
executed as a command in a separate process. This method has
exactly the same effect as exec(command, null).
Process object for managing the subprocess.
exec
public Process exec(String command,
String envp[]) throws IOException
This method breaks the command string into tokens and
creates a new array cmdarray containing the tokens; it
then performs the call exec(cmdarray, envp).
Process object for managing the subprocess.
exec
public Process exec(String cmdarray[]) throws IOException
The command specified by the tokens in cmdarray is
executed as a command in a separate process. This has exactly the
same effect as exec(cmdarray, null).
Process object for managing the subprocess.
exec
public Process exec(String cmdarray[],
String envp[]) throws IOException
If there is a security manager, its checkExec method
is called with the first component of the array
cmdarray as its argument. This may result in a security
exception.
Given an array of strings cmdarray, representing the
tokens of a command line, and an array of strings envp,
representing an "environment" that defines system
properties, this method creates a new process in which to execute
the specified command.
Process object for managing the subprocess.
freeMemory
public native long freeMemory()
totalMemory method. Calling the gc method may
result in increasing the value returned by freeMemory.
totalMemory
public native long totalMemory()
gc
public native void gc()
The name gc stands for "garbage
collector". The Java Virtual Machine performs this recycling
process automatically as needed even if the gc method
is not invoked explicitly.
runFinalization
public native void runFinalization()
finalize methods of objects
that have been found to be discarded but whose finalize
methods have not yet been run. When control returns from the
method call, the Java Virtual Machine has made a best effort to
complete all outstanding finalizations.
The Java Virtual Machine performs the finalization process
automatically as needed if the runFinalization method
is not invoked explicitly.
traceInstructions
public native void traceInstructions(boolean on)
boolean argument is true, this
method asks the Java Virtual Machine to print out a detailed trace
of each instruction in the Java Virtual Machine as it is executed.
The virtual machine may ignore this request if it does not support
this feature. The destination of the trace output is system
dependent.
If the boolean argument is false, this
method causes the Java Virtual Machine to stop performing the
detailed instruction trace it is performing.
true to enable instruction tracing;
false to disable this feature.
traceMethodCalls
public native void traceMethodCalls(boolean on)
boolean argument is true, this
method asks the Java Virtual Machine to print out a detailed trace
of each method in the Java Virtual Machine as it is called. The
virtual machine may ignore this request if it does not support
this feature. The destination of the trace output is system dependent.
If the boolean argument is false, this
method causes the Java Virtual Machine to stop performing the
detailed method trace it is performing.
true to enable instruction tracing;
false to disable this feature.
load
public synchronized void load(String filename)
java_g it will automagically insert "_g" before the
".so" (for example
Runtime.getRuntime().load("/home/avh/lib/libX11.so");).
If there is a security manager, its checkLink method
is called with the filename as its argument. This may
result in a security exception.
loadLibrary
public synchronized void loadLibrary(String libname)
First, if there is a security manager, its checkLink
method is called with the filename as its argument.
This may result in a security exception.
If this method is called more than once with the same library name, the second and subsequent calls are ignored.
getLocalizedInputStream
public InputStream getLocalizedInputStream(InputStream in)
InputStreamReader and BufferedReader
classes.
InputStream and returns an InputStream
equivalent to the argument in all respects except that it is
localized: as characters in the local character set are read from
the stream, they are automatically converted from the local
character set to Unicode.
If the argument is already a localized stream, it may be returned as the result.
getLocalizedOutputStream
public OutputStream getLocalizedOutputStream(OutputStream out)
OutputStreamWriter, BufferedWriter, and
PrintWriter classes.
OutputStream and returns an
OutputStream equivalent to the argument in all respects
except that it is localized: as Unicode characters are written to
the stream, they are automatically converted to the local
character set.
If the argument is already a localized stream, it may be returned as the result.
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